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| HD-630i | HD-620 | HD-610 | HD-4 | HD-7 | |
| SIGNALSHIELD - Digital/Data Signal Alarm | • | ||||
| "DSL Safe" - Data Filtered: Talk/Monitor | • | • | • | • | • |
| 2-Way Speakerphone - Battery Powered | • | • | |||
| "Hands Free" Operation with Headset | • | ||||
| Speaker on Monitor Mode - Battery Powered | • | • | • | • | |
| Speaker on Talk Mode - Battery Powered | • | • | |||
| Automatic Timed Speaker Turn-Off | • | • | • | • | |
| Battery Power Indication | • | • | • | • | |
| "One Touch" Memory Dialing Locations | 3 x 22 Digits | 3 x 22 Digits | 3 x 22 Digits | 3 x 21 Digits | |
| Speed Dialing Locations (Repertory Memory) | 10 x 22 Digits | 10 x 22 Digits | 10 x 22 Digits | 10 x 21 Digits | |
| Monitor Impedance greater than 120K Ohms | • | • | • | • | • |
| Craft Grade | • | • | • | • | |
| Palm Sized | • | ||||
| Rubber Gasket for Rain/Humidity Protection | • | • | • | • | |
| Passes 12' and 20' Drop Tests | • | • | • | • | |
| Ringer For Incoming Calls | • | • | • | • | • |
| Tone and Pulse Dialing | • | • | • | • | • |
| Line Polarity Indication | • | • | • | • | • |
| PBX Pulse | • | • | • | • | |
| Mute for Microphone | • | • | • | • | • |
| Over-Voltage/Over-Current Protection | • | • | • | • | • |
| Non-Slip Rubber Shoulder Pad | • | • | • | • | |
| Field Changeable Cordset | • | • | • | • | |
| Estimated Battery Life (4 AA Cells) - Speaker Full | 100 Hours + | 100 Hours + | 100 Hours + | N/A | 100 Hours + (2 AAA Cells) |
| Warranty Period | 18 Months | 18 Months | 18 Months | 18 Months | 12 Months |
